xref: /openbsd/usr.bin/what/what.c (revision 5b133f3f)

/*	$OpenBSD: what.c,v 1.17 2023/03/08 04:43:13 guenther Exp $	*/
/*	$NetBSD: what.c,v 1.4 1994/12/20 16:01:03 jtc Exp $	*/

/*
 * Copyright (c) 1980, 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/utsname.h>
#include <stdio.h>
#include <ctype.h>
#include <err.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static void search(char *);
static void usage(void);

static int matches;
static int sflag;

extern char *__progname;

/*
 * what
 */
int
main(int argc, char *argv[])
{
	struct utsname utsn;
	char match[256];
	int c;

	if (pledge("stdio rpath", NULL) == -1)
		err(1, "pledge");

	matches = sflag = 0;
	while ((c = getopt(argc, argv, "s")) != -1) {
		switch (c) {
		case 's':
			sflag = 1;
			break;
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;

	if (uname(&utsn) == -1)
		err(1, "uname");
	strlcpy(match, utsn.sysname, sizeof match);

	if (argc < 1) {
		usage();
	} else do {
		if (!freopen(*argv, "r", stdin)) {
			perror(*argv);
			exit(matches ? 0 : 1);
		}
		printf("%s:\n", *argv);
		search(match);
	} while(*++argv);
	exit(matches ? 0 : 1);
}

static void
search(char *match)
{
	int c;
	int i;

	while ((c = getchar()) != EOF) {
loop:		if (c == '$') {
			for (i = 0; match[i]; i++)
				if ((c = getchar()) != match[i])
					goto loop;
			printf("\t$%s", match);
			while (isprint(c = getchar())) {
				putchar(c);
				if (c == '$')
					break;
			}
			putchar('\n');
			matches++;
			if (sflag)
				break;
			goto loop;
		}
		if (c != '@')
			continue;
		if ((c = getchar()) != '(')
			goto loop;
		if ((c = getchar()) != '#')
			goto loop;
		if ((c = getchar()) != ')')
			goto loop;
		putchar('\t');
		while ((c = getchar()) != EOF && c && c != '"' &&
		    c != '>' && c != '\n' && c != '\\')
			putchar(c);
		putchar('\n');
		matches++;
		if (sflag)
			break;
	}
}

static void
usage(void)
{

	(void)fprintf(stderr, "usage: %s [-s] file ...\n", __progname);
	exit(1);
}